Differential Cryptanalysis of Block Cipher Halka
Keywords:
Differential cryptanalysis, block cipher Halka, multiple trail, 1-bit differenceAbstract
Halka is a lightweight block cipher proposed by
Sourav Das in 2014. The block length of Halka is 64 bits and its key length is 80 bits. Halka uses 8-bit S-box for nonlinear permutation and uses bit shuffle for the linear permutation. In the differential cryptanalysis by the designers, the number of active S-box at each round is estimated to be 2, and differential attack can be mounted up to 5 rounds of Halka. In this article,
focusing on Halka that has bit shuffle and 1-bit difference of active S-box at each round, we derive the new maximum differential characteristic probability (DCP). By analyzing trellis diagram of differential trails, we newly find that the maximum DCP of Halka is 260 for 10 rounds of single trail and 262.58 for 13 rounds of multiple trail, which are the results that the designers would not report.
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